这是一款简单的GPS记录仪。纬度和经度值每10秒登录一次SQLite数据库。
这在第一次运行我的应用程序时有效，但是当应用程序再次运行时，位置值为空，我的表永远不会更新值。
public class GPSService extends Service {
public static final String TAG = GPSService.class.getSimpleName();
private static final int ONGOING_NOTIFICATION_ID = 1000;
public static final String GPS_WAKE_LOCK = "GPSWakeLock";
public static final int GPS_TIME_THRESHOLD = 10000; // 10 sec
public static final int GPS_DISTANCE_THRESHOLD = 10; // 10 meters
public static EventBus bus = EventBus.getDefault();
private LocationManager lm;
private LocationManager locationManager2;
private LocationListener locationListener;
private Location location = null;
private Timer timer;
private DumpTask dumpTask = null;
private DatabaseHelper myDb = null;
private static boolean active = false;
private PowerManager.WakeLock wakeLock = null;
public static Double Latitude;
public static Double Longitude;
public static int TotalNoOfStations;
public float[] result = new float[2];
public int k;
public static Boolean SwitchOffAlarmService=false;
@Override
public void onCreate() {
super.onCreate();
bus.register(this);
timer = new Timer();
myDb = DatabaseHelper.getInstance(this);
lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager2 = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationListener = new MyLocationListener();
Log.d(TAG, "onCreate ");
k=0;
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onDestroy() {
Log.d(TAG, "destroyed");
bus.unregister(this);
timer.cancel();
stopService(new Intent(this,GPSService.class));
super.onDestroy();
}
@SuppressWarnings("unused")
public void onEvent(GPSLoggerCommand e) {
if (e.command == GPSLoggerCommand.START && !active) {
Log.d(TAG, "start gps logger");
getRouteDetails();
MainActivity.LocationServiceStarted=true;
getLatLonFromDB();
try {
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, GPS_TIME_THRESHOLD, GPS_DISTANCE_THRESHOLD, locationListener);
}catch (SecurityException ex){
Log.e(TAG, "onEvent " + ex.toString());
}
dumpTask = new DumpTask();
timer.schedule(dumpTask, GPS_TIME_THRESHOLD, GPS_TIME_THRESHOLD);
active = true;
} else if (e.command == GPSLoggerCommand.STOP && active) {
Log.d(TAG, "stop gps logger");
dumpTask.cancel();
try {
lm.removeUpdates(locationListener);
}catch(SecurityException ex){
Log.e(TAG, "onEvent " + ex);
}
bus.post(new StatusReply("total rows " + myDb.getRowsCount()));
stopForeground(true);
active = false;
locationManager2.sendExtraCommand(LocationManager.GPS_PROVIDER,"delete_aiding_data",null);
Bundle bundle = new Bundle();
locationManager2.sendExtraCommand("gps","force_xtra_injection",bundle);
locationManager2.sendExtraCommand("gps","fource_time_injection",bundle);
stopService(new Intent(this,GPSService.class));
} else if (e.command == GPSLoggerCommand.STATUS) {
Log.d(TAG, "onEvent send message " + active);
bus.post(new GPSLoggerStatus(active));
}
}
public class MyLocationListener implements LocationListener {
public void onLocationChanged(Location loc) {
if (loc != null) {
Log.d(TAG, "onLocationChanged " + loc.getLatitude() + ":" + loc.getLongitude());
location = loc;
}
}
public void onProviderDisabled(String provider) {
Log.d(TAG, "onProviderDisabled");
Toast.makeText(GPSService.this, "Service Canceled due to GPS being Disabled!!", Toast.LENGTH_SHORT).show();
GPSLoggerCommand c;
c = new GPSLoggerCommand(GPSLoggerCommand.STOP);
bus.post(c);
MainActivity.GPServiceStarted=false;
MainActivity.LocationServiceStarted=false;
}
public void onProviderEnabled(String provider) {
Log.d(TAG, "onProviderEnabled");
}
public void onStatusChanged(String provider, int status, Bundle extras) {
String showStatus = null;
if (status == LocationProvider.AVAILABLE)
showStatus = "Available";
if (status == LocationProvider.TEMPORARILY_UNAVAILABLE)
showStatus = "Temporarily Unavailable";
if (status == LocationProvider.OUT_OF_SERVICE)
showStatus = "Out of Service";
Log.d(TAG, "onStatusChanged " + showStatus);
}
}
public class DumpTask extends TimerTask {
@Override
public void run() {
Log.d(TAG, "dump to base");
if (location != null) {
// write to database
}
}
}
public static void StopServiceFunction()
{
GPSLoggerCommand c;
c = new GPSLoggerCommand(GPSLoggerCommand.STOP);
bus.post(c);
MainActivity.GPServiceStarted=false;
MainActivity.LocationServiceStarted=false;
active = false;
}
}
答案 0 :(得分：0)
implement GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener
在您的活动中，并在覆盖方法中使用以下代码
@Override
public void onConnected(@Nullable Bundle bundle) {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if (location == null) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, (com.google.android.gms.location.LocationListener) this);
} else {
mCurrentLatitude = location.getLatitude();
mCurrentLongitude = location.getLongitude();
Toast.makeText(this, mCurrentLongitude + " * ********"+mCurrentLatitude, Toast.LENGTH_LONG).show();
}
}